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Catalyst composition for olefin polymerization

a technology of olefin and composition, applied in the direction of catalyst activation/preparation, chemical/physical processes, organic compounds/hydrides/coordination complexes, etc., can solve the problems of large excess of used catalyst, inability to use homogeneous catalyst systems in liquid monomer or gas phase, and high cost of catalyst systems. , to achieve the effect of good polymer morphology and high polymerization activity

Inactive Publication Date: 2007-06-19
NOVOLEN TECHNOLOGY HOLDINGS CV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention is a catalyst system that includes a metallocene, a Lewis base, a support, an organic compound with active hydrogen, and an organometallic compound. The ratio of the organic compound to the organometallic compound is important and should be between 3:1 and 5:1. The technical effect of this invention is to provide a catalyst system that can effectively produce polymers with improved properties."

Problems solved by technology

However, to use metallocenes for the stereoselective and regioselective polymerization of olefins, the preparation of the isomerically pure racemic form is absolutely necessary, since the corresponding meso form produces undesired atactic polymer, like atactic polypropylene.
The disadvantage of these cocatalysts is that they have to be used in large excess.
Therefore these catalyst systems are quite expensive.
Such homogeneous catalyst systems cannot be used industrially in liquid monomer or in the gas phase.
This avoids the detachment of the of the catalyst system from the support which leads to homogeneous polymerisations and unsatisfactory polymer morphology.
However these catalyst systems have a low polymerisation activity and no organic compounds having functional groups containing active hydrogen are used for the preparation of the catalyst system.
However all of these catalyst systems still show a rather low polymerisation activity.

Method used

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  • Catalyst composition for olefin polymerization
  • Catalyst composition for olefin polymerization
  • Catalyst composition for olefin polymerization

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Catalyst System 1

[0411]a) Preparation of Tris(bis(pentafluorophenylboroxy))alane

[0412]1 mL of trimethylaluminium solution (2.1 M in Exxol) is introduced into 13 mL of toluene at room temperature, 2.17 g (6.0 mmoles) of bis(pentafluorophenyl)borinic acid are added. After the addition the suspension is heated at 60° C. for 90 minutes.

[0413]b) Preparation of Supported Tris(bis(pentafluorophenylboroxy))alane

[0414]1.5 g of SiO2 (Grace XPO 2107, dried at 180° C. and 1 mbar for 16 h) are suspended in 15 mL of toluene. 225 μL (1.5 mmoles) of N,N-dimethylbenzylamine are added, and the suspension is stirred slowly for one hour at room temperature. The solution prepared in (a) is added dropwise to this suspension at room temperature, and the resulting suspension is stirred for one hour at room temperature. The suspension is filtered through a G4 fritted glass filter, the residue is washed with 5 ml heptane and the residue is dried in a vacuum. 3.1 g of the support material are o...

example 2

Polymerization Procedure A with Catalyst System 1

[0417]A dry 1.8 dm3 autoclave is purged with nitrogen and subsequently with propylene and charged with 1500 cm3 of liquid propylene. 2 cm3 of triisobutylaluminum (20 wt.- % solution in heptane) are added and the mixture is stirred for 15 minutes at 30° C.

[0418]For the polymerizations 0.002 mmol of the respective metallocene compounds, supported according to Example 1, are used. The corresponding amount of the catalyst powder is suspended in 20 cm3 of heptane and is injected with 15 cm3 of heptane. The reaction mixture is heated to the polymerization temperature of 65° C. and polymerization is allowed to proceed at 65° C. for 60 minutes. The polymerization is stopped by releasing the liquid monomer and cooling down the reactor. The produced polymer is dried under reduced pressure at 80° C. and 380 g of polymer are obtained corresponding to an activity of 330 kg PP / (g metallocene×h). The polymer produced was a free flowing powder of sph...

example 7

Preparation of Catalyst System 4

[0432]a) Preparation of Tris(bis(pentafluorophenylboroxy))alane

[0433]1 mL of trimethylaluminium solution (2.1 M in Exxol) is introduced into 13 mL of toluene at room temperature, 2.17 g (6.0 mmoles) of bis(pentafluorophenyl)borinic acid are added. After the addition the suspension is heated at 60° C. for 90 minutes.

[0434]b) Preparation of Supported Tris(bis(pentafluorophenylboroxy))alane

[0435]1.5 g of SiO2 (Grace XPO 2107, dried at 180° C. and 1 mbar for 16 h) are suspended in 15 mL of toluene. 225 μL (1.5 mmoles) of N,N-dimethylbenzylamine are added, and the suspension is stirred slowly for one hour at room temperature. The solution prepared in (a) is added dropwise to this suspension at room temperature, and the resulting suspension is stirred for one hour at room temperature. The suspension is filtered through a G4 fritted glass filter, the residue is washed with 5 ml heptane and is dried in a vacuum. 3.0 g of the support material are obtained.

[043...

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Abstract

A process for the preparation of a catalyst system includes the steps of combining a Lewis base, an organic compound having at least one functional group containing active hydrogen, and an organometallic component with a particulate support material to provide an intermediate composition, and then combining the intermediate composition with one or more metallocene compound. The catalyst system is advantageously used for olefin polymerization.

Description

BACKGROUND[0001]1. Field of the Invention[0002]The present invention relates to a process for preparing a catalyst system for olefin polymerization which is obtainable by bringing at least one metallocene, at least one organometallic compound, at least one compound that is obtainable by a reaction of an organometallic compound with an organic compound bearing a functional group containing active hydrogen, at least one Lewis base and at least one support into contact with one another, to catalyst systems obtainable by this process, to the use of these catalyst systems for olefin polymerizations, to a process using such catalyst systems for polymerization and copolymerisation of olefins and to polymers which are prepared using such catalyst systems.[0003]2. Background of the Art[0004]Processes for preparing polyolefins using soluble, homogeneous catalyst systems comprising organic transition metal compounds such as metallocene complexes are well known (Angew. Chem. 1995, 107, 1255-128...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08F4/02C08F4/6392C08F4/64
CPCC08F10/00C08F4/65916C08F4/65908C08F4/65912C08F4/65927C08F110/06C08F4/00C08F4/20C08F4/64
Inventor SELL, THORSTENSCHOTTEK, JOERGPACZKOWSKI, NICOLA STEFANIEWINTER, ANDREAS
Owner NOVOLEN TECHNOLOGY HOLDINGS CV
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